Proper saddle positioning, vertically and horizontally, is critical for both comfort and performance. Keep in mind that the guidelines below are just a starting point. As you become more experienced with your own bike, you can make small adjustments to find the optimal position for your saddle.
With your foot at the very bottom of the pedal stroke, you should have a slight bend in your leg, for about 80-90 percent of full leg extension. This is generally true for all types of bikes.
When your right foot is at the 3 o’clock position of the pedal stroke, your knee should be directly over your forefoot. The best starting point is that which allows a plumb line dropped from the bottom of your kneecap to go past the ball of your foot and through the axle of the pedal. For this to be the case your shin must be tilted forward slightly.
The saddle should generally be parallel to the ground. Some riders prefer a very slight upward or downward tilt, depending on personal preference and the type of riding. However, parallel to the ground is the best starting point.